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1、例子

二、用数据选择器设计组合逻辑函数
1、基本原理
nnn位地址输入的数据选择器，可产生任何形式输入变量数不大于n+1n+1n+1的组合逻辑函数
2、例1

3、例2

三、用加法器设计组合逻辑电路
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1、例子

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1、基本原理
nnn位地址输入的数据选择器，可产生任何形式输入变量数不大于n+1n+1n+1的组合逻辑函数
2、例1

3、例2

三、用加法器设计组合逻辑电路
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1、例子

二、用数据选择器设计组合逻辑函数
1、基本原理
nnn位地址输入的数据选择器，可产生任何形式输入变量数不大于n+1n+1n+1的组合逻辑函数
2、例1

3、例2

三、用加法器设计组合逻辑电路
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                                <h2>
                                    3.2 常用的组合逻辑电路应用
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                                    2023-11-04, 247 words, 1 min read
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                                        <h2 id="一-用译码器设计组合逻辑函数">一、 用译码器设计组合逻辑函数</h2>
<h4 id="1-例子">1、例子</h4>
<img src="http://cos.pansis.site/202311021748015.png/abc123" alt="image-20231102174839265" style="zoom:33%;" />
<h2 id="二-用数据选择器设计组合逻辑函数">二、用数据选择器设计组合逻辑函数</h2>
<h4 id="1-基本原理">1、基本原理</h4>
<p><span class="katex"><span class="katex-mathml"><math><semantics><mrow><mi>n</mi></mrow><annotation encoding="application/x-tex">n</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.43056em;vertical-align:0em;"></span><span class="mord mathdefault">n</span></span></span></span>位地址输入的数据选择器，可产生任何形式输入变量数不大于<span class="katex"><span class="katex-mathml"><math><semantics><mrow><mi>n</mi><mo>+</mo><mn>1</mn></mrow><annotation encoding="application/x-tex">n+1</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.66666em;vertical-align:-0.08333em;"></span><span class="mord mathdefault">n</span><span class="mspace" style="margin-right:0.2222222222222222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right:0.2222222222222222em;"></span></span><span class="base"><span class="strut" style="height:0.64444em;vertical-align:0em;"></span><span class="mord">1</span></span></span></span>的组合逻辑函数</p>
<h4 id="2-例1">2、例1</h4>
<img src="http://cos.pansis.site/202311021805195.png/abc123" alt="image-20231102180520083" style="zoom:33%;" />
<h4 id="3-例2">3、例2</h4>
<img src="http://cos.pansis.site/202311021805751.png/abc123" alt="image-20231102180557617" style="zoom:33%;" />
<h2 id="三-用加法器设计组合逻辑电路">三、用加法器设计组合逻辑电路</h2>
<h4 id="1-超前进位加法器74ls283的应用">1、超前进位加法器74LS283的应用</h4>
<p>1、应用场合：输入变量间存在相加的形式</p>
<p>2、<img src="http://cos.pansis.site/202311022230246.png/abc123" alt="image-20231102223053170" style="zoom: 50%;" /></p>
<h2 id="四-组合逻辑电路中的竞争-冒险">四、组合逻辑电路中的竞争-冒险</h2>
<h4 id="1-竞争">1、竞争</h4>
<p>两个输入“同时向相 反的逻辑电平变化”， 称存在“竞争”</p>
<h4 id="2-竞争-冒险">2、竞争-冒险</h4>
<p>因“竞争”而可能在输 出产生尖峰脉冲的现象， 称为“竞争-冒险”</p>
<h4 id="3-检查竞争-冒险现象的方法">3、检查竞争-冒险现象的方法</h4>
<p>只要输出函数在一定条件下可以整理为成  𝒀 = 𝑨 + 𝑨′ 或 𝒀 = 𝑨 ∙ 𝑨′</p>
<p>则可判定存在竞争-冒险现象</p>
<img src="http://cos.pansis.site/202311022239712.png/abc123" alt="image-20231102223915668" style="zoom:50%;" />
<h4 id="4-消除竞争-冒险现象的方法">4、消除竞争-冒险现象的方法</h4>
<img src="http://cos.pansis.site/202311022241555.png/abc123" alt="image-20231102224139508" style="zoom:53%;" />
<img src="http://cos.pansis.site/202311022242358.png/abc123" alt="image-20231102224255303" style="zoom:50%;" />
<p>添加BC</p>
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